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LGA 1155, also called Socket H2, is an Intel microprocessor compatible socket which supports Intel Sandy Bridge and Ivy Bridge microprocessors. LGA is short for Land Grid Array.
LGA 1155 is designed as a replacement for the LGA 1156 (known as Socket H). LGA 1155 has 1155 protruding pins to make contact with the pads on the processor. Processors of LGA 1155 and LGA 1156 sockets are not compatible with each other since they have different socket notches. However, cooling solutions are backwards compatible between both LGA 1155 and LGA 1156 sockets, due to both having the same distance of 75 mm between each screw hole.


LGA 1156, also known as Socket H or H1, is an Intel desktop CPU socket. LGA stands for land grid array. Its incompatible successor is LGA 1155.
LGA 1156, along with LGA 1366, was designed to replace LGA 775. LGA 1156 is very different from LGA 775. LGA 775 processors were connected to a northbridge using the Front Side Bus. With LGA 1156, the features that were traditionally on a northbridge are integrated onto the processor. The LGA 1156 socket allows the following connections to be made from the processor to the rest of the system:
PCI-Express 2.0 x16 for communication with a graphics card. Some processors allow this connection to be divided into two x8 lanes to connect two graphics cards. Some motherboard manufacturers use Nvidia's NF200 chip to allow even more graphics cards to be used.
DMI for communication with the Platform Controller Hub (PCH). This consists of a PCI-Express 2.0 x4 connection.
FDI for communication with the PCH. This consists of two DisplayPort connections.
Two memory channels for communication with DDR3 SDRAM. The clock speed of the memory that is supported will depend on the processor.